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About calorie estimation
Calories are estimated based on your gender, your weight and the intensity and duration of the
exercise.
For Sports Mode, the heart rate is used to estimate calories.
Calories calculations for the TomTom Sports App are based on the MET tables of Ainsworth BE,
Haskell WL, Herrmann SD, Meckes N, Bassett Jr DR, Tudor-Locke C, Greer JL, Vezina J, Whitt-Glover
MC, Leon AS. 2011 Compendium of Physical Activities: a second update of codes and MET values.
Medicine and Science in Sports and Exercise, 2011;43(8):1575-1581.
The heart rate sensor
Your Sports device has a built-in heart rate sensor to help you train more efficiently.
How the sensor works
Your heartbeat is measured by using light to measure changes in your blood flow. This is done on
the top of your wrist by shining light through the skin onto the capillaries just below the skin and
detecting the changing light reflections.
The performance of the heart rate sensor is not affected by your body fat percentage or body hair.
It IS however affected by the position of the Sports product on your wrist, your skin colour, skin
type and by whether you have warmed up or not.
Using the heart rate sensor
Recording your resting heart rate in the morning when you are not stressed is a good fitness
indicator.
To get the best performance from the heart rate sensor, refer to your product manual for tips on
wearing your Sports device. Continuous heart rate tracking may be switched ON or OFF by default
depending on which device you have.
About body composition
TomTom Touch devices can measure your body composition. Body composition is a great indicator
of your fitness. When people exercise, what they usually want is to reduce their body fat % and
increase their muscle %.
How does body composition measurement work?
The body composition feature works by sending a small and harmless electrical current through your
body. The current flows more easily through muscle than through fat, so by measuring how much
current flows at various frequencies, an estimate of the percentage of body fat and muscle can be
calculated. Everything else that your body is composed of falls into the “other” category, for
example water or bone. Your body composition results for body fat, muscle and "other" add up to
100%.
If your device has this feature, your body composition measurement is stored by your Sports device
and then transferred to the Sports app and Sports website where you can see it alongside your
steps, calories, distance and active time metrics. This means that you can track your efforts and
results in the same place.
How we do our calculations
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